[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.45' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 717.668016] INFO: task syz-executor402:8197 blocked for more than 140 seconds. [ 717.675462] Not tainted 4.19.211-syzkaller #0 [ 717.681470] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.689888] syz-executor402 D29600 8197 8078 0x00000004 [ 717.695517] Call Trace: [ 717.698410] __schedule+0x887/0x2040 [ 717.702126] ? io_schedule_timeout+0x140/0x140 [ 717.706702] ? lock_downgrade+0x720/0x720 [ 717.711172] ? __mutex_lock+0x418/0x1190 [ 717.715232] schedule+0x8d/0x1b0 [ 717.718932] schedule_preempt_disabled+0xf/0x20 [ 717.723608] __mutex_lock+0x5f0/0x1190 [ 717.727481] ? __se_sys_perf_event_open+0x1863/0x2720 [ 717.732983] ? mutex_trylock+0x1a0/0x1a0 [ 717.737042] ? __se_sys_perf_event_open+0x1806/0x2720 [ 717.742519] ? lock_acquire+0x170/0x3c0 [ 717.746499] ? __se_sys_perf_event_open+0x1687/0x2720 [ 717.751981] ? check_preemption_disabled+0x41/0x280 [ 717.757000] __se_sys_perf_event_open+0x1863/0x2720 [ 717.762416] ? perf_event_set_output+0x4c0/0x4c0 [ 717.767164] ? __se_sys_futex+0x28f/0x3b0 [ 717.771586] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.776946] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.782321] ? do_syscall_64+0x21/0x620 [ 717.786297] do_syscall_64+0xf9/0x620 [ 717.790430] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.795612] RIP: 0033:0x7fd76da75a99 [ 717.799578] Code: Bad RIP value. [ 717.802980] RSP: 002b:00007fd76da27318 EFLAGS: 00000246 ORIG_RAX: 000000000000012a [ 717.811034] RAX: ffffffffffffffda RBX: 00007fd76dafd3e8 RCX: 00007fd76da75a99 [ 717.818480] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000020000000 [ 717.825741] RBP: 00007fd76dafd3e0 R08: 0000000000000000 R09: 0000000000000000 [ 717.833470] R10: 0000000000000003 R11: 0000000000000246 R12: 00007fd76dafd3ec [ 717.840974] R13: 00007ffda3c4f79f R14: 00007fd76da27400 R15: 0000000000022000 [ 717.848578] [ 717.848578] Showing all locks held in the system: [ 717.854915] 1 lock held by khungtaskd/1571: [ 717.859513] #0: 0000000058914efa (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 717.868356] 1 lock held by in:imklog/7758: [ 717.872572] #0: 00000000029ead48 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 717.880814] 2 locks held by syz-executor402/8197: [ 717.885651] #0: 000000007fd7c365 (&cpuctx_mutex){+.+.}, at: __se_sys_perf_event_open+0x1856/0x2720 [ 717.895135] #1: 000000007fd7c365 (&cpuctx_mutex/1){+.+.}, at: __se_sys_perf_event_open+0x1863/0x2720 [ 717.904728] [ 717.906356] ============================================= [ 717.906356] [ 717.913621] NMI backtrace for cpu 0 [ 717.917258] CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 717.924684] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.934015] Call Trace: [ 717.936585] dump_stack+0x1fc/0x2ef [ 717.940194] nmi_cpu_backtrace.cold+0x63/0xa2 [ 717.944671] ? lapic_can_unplug_cpu+0x80/0x80 [ 717.949145] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 717.954405] watchdog+0x991/0xe60 [ 717.957850] ? reset_hung_task_detector+0x30/0x30 [ 717.962680] kthread+0x33f/0x460 [ 717.966026] ? kthread_park+0x180/0x180 [ 717.969992] ret_from_fork+0x24/0x30 [ 717.973793] Sending NMI from CPU 0 to CPUs 1: [ 717.978662] NMI backtrace for cpu 1 [ 717.978669] CPU: 1 PID: 4694 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 [ 717.978675] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.978679] RIP: 0010:lock_release+0x35e/0x8b0 [ 717.978689] Code: 03 80 3c 11 00 0f 85 cc 04 00 00 49 8d be 78 08 00 00 4c 8b 28 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 be 04 00 00 4d 89 ae 78 08 00 00 8d 55 01 44 89 fe 4c 89 f7 [ 717.978693] RSP: 0018:ffff8880a0fa7e48 EFLAGS: 00000046 [ 717.978701] RAX: dffffc0000000000 RBX: ffffffff8d243760 RCX: 1ffff110141f3dd1 [ 717.978706] RDX: 1ffff110141f3dcf RSI: ffffffff89f85fa0 RDI: ffff8880a0f9ee78 [ 717.978711] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 717.978716] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff110141f4fcc [ 717.978721] R13: 0000000000000000 R14: ffff8880a0f9e600 R15: 0000000000000001 [ 717.978726] FS: 00007fae6dda98c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 717.978730] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 717.978735] CR2: 00007fae6b178000 CR3: 00000000a082c000 CR4: 00000000003406e0 [ 717.978740] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 717.978746] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 717.978748] Call Trace: [ 717.978752] ? lock_downgrade+0x720/0x720 [ 717.978756] ? check_preemption_disabled+0x41/0x280 [ 717.978760] ? check_preemption_disabled+0x41/0x280 [ 717.978763] __task_pid_nr_ns+0x28c/0x4c0 [ 717.978767] __ia32_sys_getpid+0x1a/0x20 [ 717.978770] do_syscall_64+0xf9/0x620 [ 717.978774] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.978777] RIP: 0033:0x7fae6d041f17 [ 717.978787] Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 [ 717.978791] RSP: 002b:00007fff0b3b0968 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 [ 717.978800] RAX: ffffffffffffffda RBX: 000055caaf9991e0 RCX: 00007fae6d041f17 [ 717.978805] RDX: 00000000000000e0 RSI: 0000000000000000 RDI: 000055caaf9991e0 [ 717.978810] RBP: 0000000000000000 R08: 000055caaf998a7c R09: 000055caaf99925c [ 717.978815] R10: 000055caaf9991e0 R11: 0000000000000202 R12: 0000000000001256 [ 717.978820] R13: 00007fff0b3b0aa8 R14: 000055caaef8c958 R15: 0005e1176d415ec7 [ 717.980220] Kernel panic - not syncing: hung_task: blocked tasks [ 718.207064] CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.214491] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.223838] Call Trace: [ 718.226417] dump_stack+0x1fc/0x2ef [ 718.230086] panic+0x26a/0x50e [ 718.233271] ? __warn_printk+0xf3/0xf3 [ 718.237161] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.241637] ? ___preempt_schedule+0x16/0x18 [ 718.246026] ? watchdog+0x991/0xe60 [ 718.249644] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.255075] watchdog+0x9a2/0xe60 [ 718.258510] ? reset_hung_task_detector+0x30/0x30 [ 718.263333] kthread+0x33f/0x460 [ 718.266680] ? kthread_park+0x180/0x180 [ 718.270634] ret_from_fork+0x24/0x30 [ 718.274593] Kernel Offset: disabled [ 718.278214] Rebooting in 86400 seconds..